dt: add a local manifest and a readme

README.md

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+# Pre-Oreo Mediatek common-tree
+> such repo, much nice, wow!
+
+# How to download ?
+Download / git clone this repository to :  
+`$android_src/vendor/mediatek`  
+or copy [vmtk.xml](https://raw.githubusercontent.com/Moyster/o_vendor_mediatek/los-15.0/vmtk.xml) to :  
+`$android_src/.repo/local_manifests/`  
+then simply `repo sync` your sources  
+
+# How to use ?
+Include both `VendorConfig.mk` & `VendorProduct.mk` in your device tree like so :  
+- `BoardConfig.mk` :  
+`$(call inherit-product, $(SRC_TARGET_DIR)/vendor/mediatek/VendorConfig.mk)`  
+  
+- `device(_product).mk` :  
+`$(call inherit-product, $(SRC_TARGET_DIR)/vendor/mediatek/VendorProduct.mk)`  
+
+# How to apply the patches ?
+Patches located in the patches folder can be applied from the root of your android sources :  
+`. vendor/mediatek/install.sh` & `. vendor/mediatek/uninstall.sh` 

vmtk.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<manifest>
+	<remote fetch="git://github.com/" name="gh" /> 
+	<project name="Moyster/o_vendor_mediatek" path="vendor/mediatek" remote="gh" revision="los-15.0" />
+</manifest>